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dust reduction system
A dust reduction system, or dust removal system, is used in several makes of digital cameras to remove dust from the image sensor. Every time lenses are changed, dust may enter the camera body and settle on the image sensor.
DSLRs are particularly vulnerable to this issue, since the interior of the camera is exposed during lens changes unlike other forms of digital cameras, and the image sensor is fixed, unlike a film camera. Even the tiniest (micrometre-size) dust particles or other contaminants that settle on the face of the image sensor (individual pixels of which have dimensions on the order of ~5 micrometres) may cast shadows and thus become visible in the final image as more or less diffuse grey blobs, depending on aperture.
Dust may be generated by internal moving parts or may be moved by air currents within the camera. Some systems remove or clean the sensor by vibrating at a very high frequency—between 100hertz and 50kilohertz.
== Types of systems ==
Different manufactures employ their own version of dust abatement. One type uses a piezo crystal to vibrate a filter which covers the sensor. The second type moves the actual sensor〔—this may be supplemented by a controlled flow of air.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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